Ward of Flame - This is your main tank healing ability. It is spammable and does two things at once, heal and shield.

Link of Misery - This is a buff for the tank that mitigates 10% damage. It makes a noticeable impact on tanks; especially low-geared ones.

Healing Spray - Heal Over Time.

Hideous Reconstruction - Heal Over Time.

Soothing Stream - Heal Over Time. Takes some micro-management.

Symbol of the Torch - An excellent absorb.

Orbs of the Stream - Your emergency tank healing button. Macro it with Tidal Surge and it's a very effective tank CD every 45sec.

Foul Growth & Loathsome Restoration - These are excellent backup heals that I will explain how to use. Usually, you won't have to resort to these for tank healing, but in the odd case you do, it's nice to have em.

AOE Healing

Healing Effusion - Instant cast, big AOE heals, mana intensive but spammable in this build because you have the ridiculously awesome mana regen skill Empowered Affliction from Defiler. Macro Flashover to this for a nice big AOE burst and because Flashover is mostly wasted on anything else in this build.

On the chance you get a tank that's a winner, you can leave out Soothing Stream and replace step 4,8 with damage dealing abilities or whatever.

If you get a spike damage prone tank, you can start off with 4x Soothing Stream already rolling, include Loathsome Restoration and throw Symbol of the Torch into the normal rotation (i usually leave it free for emergencies).

On the very off off chance your tank is just terribad and eating damage like twinkies, replace Soothing Stream (step 4,8) with 2x or 3x casts of Foul Growth. This is where the build's flexibility comes in. The Foul Growths will sit there ready for you to pop with Loathsome Restoration for a big burst heal. This is also effective when you know big damage is incoming. Normally, you will rarely have to resort to Foul Growth.

Conclusion

This build gives you access to some fun cleric healing abilities like hassle-free shields from Caregiver's Blessing and Ward of Flame, a Defiler Link, very active Shared Excess and a high crit rating (which I find fun when your 3 hots are rolling big numbers).

There's a lot of synergy going on that's not apparent but very effective. Your absorbs fully maximize your hots and having 3 hots with a higher crit rating is lots of HPS. Loathsome Restoration is very flexible and provides quick, raw heals when you need it. A 1.5sec Foul Growth followed by a Loathsome Restoration is a great spot heal for dps.

The build's biggest weakness is that it only has one true tank healing CD, a Tidal Surge'd Orbs of the Stream. However, you can game Foul Growth as mentioned above for emergency heals. Learn to weave Empowered Affliction into your healing and mana will never be an issue.